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Somatic embryogenesis in mono and poly embryonic varieties of mango

Mango ( Mangifera indica L.) is the most important fruit crop because of its wide adaptability, high nutritive value, richness in variety, delicious taste, excellent flavour, attractive appearance and commercial utility in India as well as in many part of the world.Polyembryonic cultivars are good rootstock because of moderate canopy, tolerant to draught, salt, environmental stress (wind, high
temperature, air pollution), fungal disease (anthracnose, powdery mildew, gummosis) and hoppers.

Somatic embryogenesis in mono and poly embryonic varieties of mango

2.
Introduction
• Mango ( Mangifera indica L.) is the most important fruit crop
because of its wide adaptability, high nutritive value, richness
in variety, delicious taste, excellent flavour, attractive
appearance and commercial utility in India as well as in many
part of the world.
• Conventional breeding in perennial crops is difficult and time
consuming.
• A standard uniform protocol of regeneration is the prime and
foremost prerequisite for not only improve the productivity, the
production from the existing area but also development of
transgenics in mango for various traits.

3.
• Day-by-day, breeders are introducing various new mango
varieties but availability of good rootstock is still lacking.
• Most of the commercial mango varieties were sensitive to
various biotic and abiotic stress.
• The quality of fruits and plant growth is affected by rootstock.
• According to various reports, there is a stagnation in the area
and production of mango with an average productivity of 6
t/ha.
• In India, soil salinity is becoming a major problem and nearly
6.73 million hectares of area is under salt affected soils.
• Salinity is a serious limitation for bringing large geographical
areas under mango cultivation particularly at early stages of
growth.
Why rootstocks?

4.
• Polyembryonic cultivars are good rootstock because of moderate
canopy, tolerant to draught, salt, environmental stress (wind, high
temperature, air pollution), fungal disease (anthracnose, powdery
mildew, gummosis) and hoppers.
• Polyembryonic mango genotypes (e.g. Kurakkan, 13-1) are
reported to have salt tolerance.
• The mango variety '13-1' is a promising salt tolerant rootstock
from Israel where the average productivity is 30-35 t/ha.
• Salt tolerant rootstocks need to be identified for increasing the
area, production and productivity of mango.
• Besides, tissue culture can also help in clonal multiplication of
root stock through nucellar embryogenesis.
• We report here genotype response (mono and poly embryonic) of
mango in terms of nucellar embryogenesis.

5.
Material and Methods
• 3.5 cm long immature fruits of mango were harvested and
brought to laboratory.
• Fruits were opened and ovules were isolated under aseptic
conditions and the ovules were bisected longitudinally.
• Intact ovular halves containing nucellar tissues were
carefully scooped out and placed on induction medium.
• The developed embryos were kept under different
temperature regime (5, 15 and 25 0C) to asses conversion
efficiency of embryos.
• The complete regeneration medium used during the course of
studies as follows:

9.
• Among all polyembryonic cultivars. Bappakai produced 187.33
embryos per explant followed by Kurukkan 158.33 embryos per
expalnt and Movandan 146.45 embryos per explant, where as
monoembryonic cultivars shows comparatively lower level of
somatic embryogenesis.
• Dashehari gave rise to 97.25 embryos per explant followed by
Amrapali 82.33 embryos in 100 days under dark culture
conditions.
• However, all the differentiated embryos proliferated on medium
having low level of sucrose (4% w/v) and auxin (2.26μM 2, 4-D).
• Most of the proembryonic calli converted into heart shaped and
cotyledonary embryos by reducing temperature to 15oC.

12.
G H
I
Different stages of somatic embryogenesis in mango
Different stages of somatic embryogenesis in mango (Mangifera indica L). G-
rooting and conversion into early stage of plants and H-rooted plants growing
vigorously in liquid culture medium and I- plant in polyhouse during acclimatization.

15.
Conclusion
• Rootstocks offer the possibility of improving yields
and managing tree size without increasing input costs.
• This is despite the availability of a diverse range of
polyembryonic cultivars that could be used as
rootstocks.
• By using good quality rootstocks, we can produce
export quality mango even in waste/barren land.